What does DOT stand for?
ANSWER
(Department of Transportation)
Determines labelling and packaging requirements. There are some important directions and
specific labelling when packaging radioactive materials as well as special receipt procedures.
Film badge
ANSWER
Detector that is a piece of radiation sensitive film that is housed in a light and vapor proof
envelope.
Pocket Dosimeter
ANSWER
A. Direct Read Pocket Dosimeter
Size and shape of a pen that contains a small ionization chamber
By pointing the instrument at a light source, the exposure reading is viewed on a translucent
scale which is shown in units of exposure.
B. Digital Electronic Dosimeter
Provides an immediate exposure readout (can be read while worn)
The electronic counter inside the dosimeter displays the accumulated exposure and dose
rate in digital form.
Thermo Luminescence Dosimeter (TLD) (Ring badge)
ANSWER
• Also known as a ring badge
1
,• Contains lithium fluoride crystals as sensing material. When ionizing radiation enters the
dosimeter, it generates free electrons and holes pair that can be trapped inside the crystal
material.
Optically Stimulated Luminescence (OSL) Dosimeter
ANSWER
• Similar to TLD ring badges, however, these badges contain aluminum oxide crystals. When
it is time to assess the dose, the trapped electrons are freed by exposing the dosimeter to a
laser or LED light.
DOSE CALIBRATOR QC - CONSTANCY
ANSWER
• Performed DAILY, upon installation, after repair or if the dose calibrator is relocated.
• Used to verify the dose calibrator is measuring radioactivity precisely.
• usually Cs-137
DOSE CALIBRATOR QC - LINEARITY
ANSWER
Performed Quarterly (every 3 months), upon installation, after repair or if the dose calibrator
is relocated.
• Checks if the calibrator is able to accurately measure the correct activity over the entire
range of use.
• Test is done by using a vial or syringe of Tc-99m
DOSE CALIBRATOR QC - ACCURACY
ANSWER
• Performed ANNUALLY, upon installation, after repair or if the dose calibrator is relocated.
• Assesses the ability of a dose calibrator to provide a true measurement of isotope fre-
quently used.
• A total of 3 (or more) consecutive measurements of the reference source are taken.
2
, Certification
ANSWER
ARRT:
NMTCB:
A process by which a nongovernmental organization grants recognition to an individual who
has met predetermine qualifications.
What are the 3 advisory groups?
ANSWER
International Commission on Radiological Protection (ICRP)
International Commission on Radiation Units & Measurements (ICRU)
National Council on Radiation Protection (NCRP)
Gas Ionization Curve
ANSWER
In order from lowest to highest
1. Recombination Region
2. Ionization Region
3. Proportional Region
4. Limited Proportional Region
5. Geiger-Mueller Region
6. Self (Continuous) Discharge Region
Ionization region vs. GM region (gas ionization curve)
ANSWER
The ionization region has a lower applied voltage than the Geiger-Mueller Region
3
ANSWER
(Department of Transportation)
Determines labelling and packaging requirements. There are some important directions and
specific labelling when packaging radioactive materials as well as special receipt procedures.
Film badge
ANSWER
Detector that is a piece of radiation sensitive film that is housed in a light and vapor proof
envelope.
Pocket Dosimeter
ANSWER
A. Direct Read Pocket Dosimeter
Size and shape of a pen that contains a small ionization chamber
By pointing the instrument at a light source, the exposure reading is viewed on a translucent
scale which is shown in units of exposure.
B. Digital Electronic Dosimeter
Provides an immediate exposure readout (can be read while worn)
The electronic counter inside the dosimeter displays the accumulated exposure and dose
rate in digital form.
Thermo Luminescence Dosimeter (TLD) (Ring badge)
ANSWER
• Also known as a ring badge
1
,• Contains lithium fluoride crystals as sensing material. When ionizing radiation enters the
dosimeter, it generates free electrons and holes pair that can be trapped inside the crystal
material.
Optically Stimulated Luminescence (OSL) Dosimeter
ANSWER
• Similar to TLD ring badges, however, these badges contain aluminum oxide crystals. When
it is time to assess the dose, the trapped electrons are freed by exposing the dosimeter to a
laser or LED light.
DOSE CALIBRATOR QC - CONSTANCY
ANSWER
• Performed DAILY, upon installation, after repair or if the dose calibrator is relocated.
• Used to verify the dose calibrator is measuring radioactivity precisely.
• usually Cs-137
DOSE CALIBRATOR QC - LINEARITY
ANSWER
Performed Quarterly (every 3 months), upon installation, after repair or if the dose calibrator
is relocated.
• Checks if the calibrator is able to accurately measure the correct activity over the entire
range of use.
• Test is done by using a vial or syringe of Tc-99m
DOSE CALIBRATOR QC - ACCURACY
ANSWER
• Performed ANNUALLY, upon installation, after repair or if the dose calibrator is relocated.
• Assesses the ability of a dose calibrator to provide a true measurement of isotope fre-
quently used.
• A total of 3 (or more) consecutive measurements of the reference source are taken.
2
, Certification
ANSWER
ARRT:
NMTCB:
A process by which a nongovernmental organization grants recognition to an individual who
has met predetermine qualifications.
What are the 3 advisory groups?
ANSWER
International Commission on Radiological Protection (ICRP)
International Commission on Radiation Units & Measurements (ICRU)
National Council on Radiation Protection (NCRP)
Gas Ionization Curve
ANSWER
In order from lowest to highest
1. Recombination Region
2. Ionization Region
3. Proportional Region
4. Limited Proportional Region
5. Geiger-Mueller Region
6. Self (Continuous) Discharge Region
Ionization region vs. GM region (gas ionization curve)
ANSWER
The ionization region has a lower applied voltage than the Geiger-Mueller Region
3
